index.ts

import typescript, { CompilerOptions } from 'typescript';

export function vitePluginTypescriptTranspile({ fileRegex = /\.ts$/, cwd = process.cwd(), compilerOverrides = {
  inlineSources: true,
  inlineSourceMap: true,
  sourceMap: false,
  moduleResolution: typescript.ModuleResolutionKind.Bundler,
  module: typescript.ModuleKind.ES2022
} }: { fileRegex?: RegExp, cwd?: string; compilerOverrides?: CompilerOptions }) {
  const fileName = typescript.findConfigFile(cwd, typescript.sys.fileExists);
  if (!fileName) throw 'tsconfig.json not found!';

  const text = typescript.sys.readFile(fileName);
  if (text === undefined) throw new Error(`failed to read '${fileName}'`);

  const result = typescript.parseConfigFileTextToJson(fileName, text);
  if (result.error !== undefined)
    throw new Error(`failed to parse '${fileName}'`);

  const parsedTsConfig = typescript.parseJsonConfigFileContent(result.config, typescript.sys, cwd);

  const compilerOptions: CompilerOptions = {
    ...parsedTsConfig.options,
    ...compilerOverrides
  }

  return {
    name: 'typescript-transpile',

    transform(src: string, id: string) {
      if (fileRegex.test(id)) {
        const program = typescript.transpileModule(src, {
          compilerOptions,
          fileName: id
        });

        return {
          code: program.outputText,
          map: program.sourceMapText
        };
      }
    }
  };
}